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Maintaining the correct fibre orientations and stacking sequence incarbon-fibre reinforced polymers (CFRP) during manufacture is essential forachieving the required mechanical properties of a component. This paperpresents and evaluates a method for the rapid characterisation of the fibreorientations present in CFRP structures, and the differentiation of differentstacking sequences, through the Radon-transform analysis of complex-valuededdy-current testing (ECT) inspection data. A high-frequency (20 MHz)eddy-current inspection system was used to obtain 2D scans of a range of CFRPsamples of differing ply stacking sequences. The complex electrical impedancescan data was analysed using Radon-transform techniques to quickly and simplydetermine the dominant fibre orientations present in the structure. This methodis compared to 2D-fast Fourier transform (2D-FFT) analysis of the same data andshown to give superior quantitative results with comparatively fewercomputational steps and corrections. Further analysis is presenteddemonstrating and examining a method for preserving the complex informationinherent within the eddy-current scan data during Radon-transform analysis.This investigation shows that the real and imaginary components of the ECT dataencode information about the sacking sequence allowing the distinction betweencomposites with different stacking structures. This new analysis techniquecould be used for in-process analysis of CFRP structures as a more accuratecharacterisation method, reducing the chance of costly manufacturing errors.

Characterisation of carbon fibre-reinforced polymer composites through complex Radon-transform analysis of eddy-current data